Foal owners need to be especially mindful of Parascaris equorum, commonly known as ascarids, the most dangerous worms found in these youngsters, according to D. Craig Barnett, DVM, senior equine technical services veterinarian for Intervet-Schering Plough Animal Health (ISPAH). He reported that ascarid populations at several breeding farms have developed resistance to ivermectin and moxidectin,

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